--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/env/lib/python3.7/site-packages/cwltool/tests/test_override.py	Sat May 02 07:14:21 2020 -0400
@@ -0,0 +1,98 @@
+import json
+
+from six import StringIO
+
+import pytest
+
+from cwltool.main import main
+from cwltool import load_tool
+from .util import get_data, needs_docker
+
+override_parameters = [
+    ([get_data('tests/override/echo.cwl'),
+      get_data('tests/override/echo-job.yml')],
+     {"out": "zing hello1\n"}
+     ),
+    (["--overrides",
+      get_data('tests/override/ov.yml'),
+      get_data('tests/override/echo.cwl'),
+      get_data('tests/override/echo-job.yml')],
+     {"out": "zing hello2\n"}
+     ),
+    ([get_data('tests/override/echo.cwl'),
+      get_data('tests/override/echo-job-ov.yml')],
+     {"out": "zing hello3\n"}
+     ),
+    ([get_data('tests/override/echo-job-ov2.yml')],
+     {"out": "zing hello4\n"}
+     ),
+    (["--overrides",
+      get_data('tests/override/ov.yml'),
+      get_data('tests/override/echo-wf.cwl'),
+      get_data('tests/override/echo-job.yml')],
+     {"out": "zing hello2\n"}
+     ),
+    (["--overrides",
+      get_data('tests/override/ov2.yml'),
+      get_data('tests/override/echo-wf.cwl'),
+      get_data('tests/override/echo-job.yml')],
+     {"out": "zing hello5\n"}
+     ),
+    (["--overrides",
+      get_data('tests/override/ov3.yml'),
+      get_data('tests/override/echo-wf.cwl'),
+      get_data('tests/override/echo-job.yml')],
+     {"out": "zing hello6\n"}
+     ),
+    ([get_data('tests/override/env-tool_v1.1.cwl'),
+      get_data('tests/override/env-tool_cwl-requirement_override.yaml')],
+     {"value": "hello test env"}
+     ),
+    (["--enable-dev",
+      get_data('tests/override/env-tool_cwl-requirement_override_default.yaml')],
+     {"value": "hello test env"}
+     ),
+]
+
+@needs_docker
+@pytest.mark.parametrize('parameters,result', override_parameters)
+def test_overrides(parameters, result):
+    sio = StringIO()
+
+    assert main(parameters, stdout=sio) == 0
+    assert json.loads(sio.getvalue()) == result
+
+
+failing_override_parameters = [
+    ([get_data('tests/override/env-tool.cwl'),
+      get_data('tests/override/env-tool_cwl-requirement_override.yaml')],
+     "`cwl:requirements` in the input object is not part of CWL v1.0. You can "
+     "adjust to use `cwltool:overrides` instead; or you can set the cwlVersion to "
+     "v1.1"
+     ),
+    ([get_data('tests/override/env-tool_v1.1.0-dev1.cwl'),
+      get_data('tests/override/env-tool_cwl-requirement_override.yaml')],
+     "Version 'v1.1.0-dev1' is a development or deprecated version.\n"
+     " Update your document to a stable version (v1.0, v1.1) or use --enable-dev to "
+     "enable support for development and deprecated versions."
+     ),
+    ([get_data('tests/override/env-tool_cwl-requirement_override_default_wrongver.yaml')],
+     "`cwl:requirements` in the input object is not part of CWL v1.0. You can "
+     "adjust to use `cwltool:overrides` instead; or you can set the cwlVersion to "
+     "v1.1 or greater."
+     ),
+    ([get_data('tests/override/env-tool_cwl-requirement_override_default.yaml')],
+     "Version 'v1.1.0-dev1' is a development or deprecated version.\n"
+     " Update your document to a stable version (v1.0, v1.1) or use --enable-dev to "
+     "enable support for development and deprecated versions."
+     ),
+]
+
+@needs_docker
+@pytest.mark.parametrize('parameters,expected_error', failing_override_parameters)
+def test_overrides_fails(parameters, expected_error):
+    sio = StringIO()
+
+    assert main(parameters, stderr=sio) == 1
+    stderr = sio.getvalue()
+    assert expected_error in stderr, stderr